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Finding the Fourth Proportional to 261.81, 394.23 and 215.97

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Solution

The fourth proportional to 261.81, 394.23 and 215.97 is: 325.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.81 : 394.23 = 215.97 : x
  2. Step 2: Convert to fraction form
    261.81/394.23 = 215.97/x
  3. Step 3: Cross multiply
    261.81x = 394.23 × 215.97
  4. Step 4: Simplify right side
    261.81x = 85,141.85
  5. Step 5: Solve for x
    x = 85,141.85/261.81
  6. Step 6: Final answer
    x = 325.20

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.